Fighter aircraft helmet



FIG. 1 is a front and left side perspective view of fighter aircraft helmet, embodying my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof, the right side elevation view being a mirror image of the side shown;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a rear elevational view thereof.

The broken line showing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a fighter aircraft helmet, as shown and described. 